Question

IF "F"IS negative,this indicates that it is a........lens

Answer 1

Explanation:

if F is negative this indicates that it is a concave lens

Answer 2

Answer:

Explanation:

For focal length, f in lens is always taken as negative for concave and positive for convex. In case of mirror the f is taken as negative if it is in -X side i.e., is in Concave mirror and taken as positive if it is in +X side i.e., is in Concave